Anadara gibbosa
| Anadara gibbosa | ||||||||||||
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Anadara gibbosa |
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| Scientific name | ||||||||||||
| Anadara gibbosa | ||||||||||||
| ( Reeve , 1844) |
Anadara gibbosa is a shell - type from the family of ark shells (Arcidae) in the order of Arcida . It occurs in the eastern Atlantic and the Mediterranean.
features
The equally flared, strongly expanded housing is egg-shaped in outline and is up to 7 cm long, but mostly only 3 to 4 cm. The dorsal margin is straight and merges with the rounded posterior margin at an obtuse angle. The angle formed by the dorsal margin and the anterior margin is slightly steeper. The umbo is slightly shifted into the front half, the vertebrae are clearly twisted forward and come close.
The upper edge of the lock plate is straight, the lower edge slightly concave. The lock is taxodont . The teeth become increasingly longer outwards and diverge outwards. The ligament lies centrally between the vertebrae. The two sphincters are approximately the same size.
The shell is white and has a firm shell. Usually only remnants of the brown to yellow periostracum are left. The ornamentation consists of 25 to 27 radial ribs. The ribs are narrow, rounded and also knotty thickened in the interfaces with stronger growth lines. The inside of the shell is usually brownish to purple in color.
Geographical distribution and habitat
The distribution area of the species extends in the eastern Atlantic from southern Portugal to Angola . It is also found in coastal waters in the Mediterranean , the Canary Islands and the Cape Verde Islands .
The animals live in a depth of approx. 5 to 500 meters (22 to 240 m) half buried in silty and sandy soils. They are filter feeders that feed on microorganisms.
Yeşim Büyükmerıç et al. (2018) described the species from the sub-Pliocene Samandağ formation in Turkey.
Taxonomy
The taxon was set up in 1844 by Lovell Augustus Reeve as Arca gibbosa . Today it is uniformly placed under the genus Anadara Gray, 1847. MolluscaBase lists the following synonyms : Arca polii Mayer, 1868, Arca sphaerica Kobelt, 1888 and Arca talismani Locard, 1898. Markus Huber assumes that the type locality was in the Mediterranean.
literature
- Markus Huber: Compendium of bivalves. 901 S., Hackenheim, ConchBooks, 2010, ISBN 978-3-939767-28-2 (hereinafter abbreviated to Huber, Compendium of Bivalves with corresponding page number)
- Wilhelm Kobelt: The genus Arca L. In illustrations according to nature with descriptions. Systematic Conchylia Cabinet by Martini and Chemnitz, 8 (2): 1-238, Nuremberg 1891 Online at www.biodiversitylibrary.org (p. 170/71), plate 43 .
Individual evidence
- ^ Kent Carpenter, Nicoletta De Angelis: The Living Marine Resources of the Eastern Central Atlantic. Volume 2 Bivalves, gastropods, hagfishes, sharks, batoid fishes, and chimaeras. Food and Agriculture Organization of the United Nations, Rome, 2016 (FAO Species Identification Guide for Fishery Purposes) PDF ; 29.2 MB, p. 696.
- ↑ a b Huber, Compendium of Bivalves, p. 129 (left fig., 2nd row from above), p. 572.
- ↑ Yeşim Büyükmerıç, Erdoğan Tekın, Erdal Herece, Koray Sözerı, Nihal Akça, Baki Varol: Early Pliocene molluscs from the easternmost Mediterranean region (SE Turkey): biostratigraphic, ecostratigraphic, and palaeobiogeographic implications. Turkish Journal of Earth Sciences, 27: 127-151, 2018 {{doi: 10.3906 / yer-1705-2}}
- ^ Lovell Augustus Reeve: Conchologia iconica, or, Illustrations of the shells of molluscous animals. Vol. 2, Reeve Brothers, London, 1843-1844. Online at www.biodiversitylibrary.org (Plate 4, Fig. 20).
- ↑ MolluscaBase: Anadara gibbosa (Reeve, 1844)